GTK code work

[Eyal Lotem <peaker makif omer k12 il>]

Hello,
    I am having trouble compiling/patching the GTK code
myself, so I
would appriciate it if someone could apply these
2-minute-work changes:

gtk_init_check renamed to gtk_init_check_real, and
accpeting a boolean
parameter whether to call g_atexit or not.
Then creating gtk_init_check to call
gtk_init_check_real with TRUE.
The globalizing gtk_init_check_real.
Renaming gtk_exit_func to gtk_uninit, and globalizing
it

This change is crucial for some things, and adds
flexibility.
It is also backwards compatible.
Thanks, Eyal Lotem